So the question is are the two without stamps mausers and one with RM S stamp mauser too or are they all Toks?
Those two without stamps are with copper colored bullets with 3 crimps.
RM S too 3 crimp and copper colored bullet.
Im pretty sure that this is 7.63x25 mauser because maker is Rheinnmetal (?)
Overall lenght@ all 3 is 34.8mm so the lenght is same as S&B tok ammo.
The unmarked ones look like Eastern Bloc Tokarev rounds.
RM S is for Rheinische Metallwarenfabrik in Sommerda. The old name of what nowadays is Rheinmetall. That is indeed a 7.63 Mauser round.
Surplus Tok rounds were imported and repackaged / sold as Mauser rounds in the past. I recall shooting Interarms branded 7.62 Tokarev years ago. Corrosive primed barrel fouling stuff, labeled as 7.63 Mauser :)